1: νικάω
(Strong's #3528 — Verb — nikao — nik-ah'-o )

is used (a) of God, Romans 3:4 (a law term), RV, "mightest prevail;" (b) of Christ, John 16:33; Revelation 3:21; 5:5; 17:14; (c) of His followers, Romans 12:21 (2nd part); 1—John 2:13,14; 4:4; 5:4,5; Revelation 2:7,11,17,26; 3:5,12,21; 12:11; 15:2; 21:7; (d) of faith, 1—John 5:4; (e) of evil (Passive Voice), Romans 12:21; (f) of predicted human potentates, Revelation 6:2; 11:7; 13:7 .

2: ἡττάομαι
(Strong's #2274 — Verb — hettaomai — hayt-tah'-o )

"to be made inferior, be enslaved," is rendered "is (are) overcome," in 2—Peter 2:19,20 . See INFERIOR.

3: κατακυριεύω
(Strong's #2634 — Verb — katakurieuo — kat-ak-oo-ree-yoo'-o )

is translated "overcome" in Acts 19:16; see MASTER , B.